Cooling equipment for preparing superparamagnetic ferrite nanoparticles through high-temperature thermal decomposition

Abstract

The utility model relates to the technical field of production of nano composite materials, in particular to cooling equipment for preparing superparamagnetic ferrite nano particles through high-temperature thermal decomposition, which comprises a cooling tower, a cold source module, a distributed composite multi-stage cooling module, an electric control pump set, an electric control valve, a connecting pipeline, a temperature sensor, an ultrasonic flowmeter, a cooling box and a control module, according to the method, the temperature distribution uniformity can be ensured while the cooling rate is met in the cooling link of preparing the superparamagnetic ferrite nanoparticles, and the magnetic balance, dispersity and large-scale requirements of preparing the superparamagnetic ferrite nanoparticles are met.

Description

Technical Field

[0001] This utility model relates to the field of nanocomposite material production technology, specifically a cooling device for preparing superparamagnetic ferrite nanoparticles by high-temperature thermal decomposition. Background Technology

[0002] High-temperature pyrolysis is a mature and efficient method for preparing superparamagnetic ferrite nanoparticles, which exhibit low defect rates and excellent crystallinity. During the high-temperature pyrolysis preparation process, the superparamagnetic ferrite nanoparticles are in a high-temperature growth state. After preparation, the growth rate slows down during the cooling process. Traditional slow cooling processes can easily lead to uneven temperature distribution in the reaction system, affecting particle uniformity. Rapid cooling, on the other hand, may induce lattice distortion or amorphous regions, resulting in decreased magnetization and directly affecting lattice stress release. Simultaneously, uneven temperature distribution during the cooling phase of the colloidal dispersion can also lead to a wider particle size distribution in the prepared superparamagnetic ferrite nanoparticles. Therefore, rapid and uniform cooling is a crucial factor affecting the quality of superparamagnetic nanoparticles.

[0003] Existing technologies using jacketed or semi-tube cooling systems in reactors are prone to localized temperature differences exceeding ±5°C due to limited heat exchange area, leading to colloidal particle aggregation. While relying on water / ice-water circulation, the surge in heat load during mass production renders traditional cooling systems inadequate for timely heat dissipation, necessitating frequent shutdowns for unblocking. Although gas-phase cooling using cryogenic media such as liquid nitrogen provides rapid cooling, direct contact can cause the colloidal phase to freeze and separate, with volatile components coking on the condenser inner wall, requiring an additional indirect heat exchange system, increasing equipment complexity and cost. The phase change characteristics of colloidal dispersions necessitate dynamic adjustment of the cooling rate, but existing equipment often employs a fixed cooling rate, resulting in abrupt changes in dispersion viscosity and particle sedimentation. Therefore, currently, there is no equipment capable of rapid and uniform cooling.

[0004] In order to improve the production capacity of superparamagnetic ferrite nanoparticles while avoiding the problems of temperature distribution uniformity, control precision and cooling rate matching in the existing technology when used for large-scale production, it is necessary to provide a cooling device for the preparation of superparamagnetic ferrite nanoparticles by high-temperature thermal decomposition that can ensure temperature distribution uniformity while meeting the cooling rate requirements, so as to meet the requirements of magnetic balance, dispersion and large-scale preparation of superparamagnetic ferrite nanoparticles. Utility Model Content

[0005] The cooling device for preparing superparamagnetic ferrite nanoparticles by high-temperature thermal decomposition described in this utility model adopts a distributed composite multi-stage cooling module. It combines a multi-parameter sensor network to collect temperature control data as the control parameters for the distributed pump group and valves. The control module then uses the distributed pump group and valves to perform graded control of the flow rate, thereby ensuring temperature uniformity while achieving the cooling rate.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a cooling device for preparing superparamagnetic ferrite nanoparticles by high-temperature thermal decomposition, comprising: a cooling tower, a cold source module, a distributed composite multi-stage cooling module, an electrically controlled pump group, an electrically controlled valve, connecting pipes, a temperature sensor, an ultrasonic flow meter, a cooling box, and a control module, characterized in that the distributed composite multi-stage cooling module comprises at least one plate heat exchanger and at least one spiral tube microchannel;

[0007] The distributed composite multi-stage cooling module, temperature sensor, and ultrasonic flow meter are installed inside the cooling box, while the cooling tower, cold source module, electrically controlled pump set, electrically controlled valve, and control module are installed outside the cooling box.

[0008] One end of the electrically controlled pump unit is connected to the cooling tower via a connecting pipe, and the other end is fixed to the outer wall of the cooling box and connected to the plate heat exchanger via a connecting pipe.

[0009] One end of the electrically controlled valve is connected to the cold source module via a connecting pipe, and the other end is fixed to the outer wall of the cooling box and connected to the spiral tube microchannel via a connecting pipe.

[0010] The cooling tower, cold source module, electrically controlled pump set, electrically controlled valve, temperature sensor, and ultrasonic flow meter are electrically connected to the control module.

[0011] Preferably, the cooling tower is one of the following: counter-flow cooling tower, cross-flow cooling tower, closed-circuit cooling tower, and combined flow cooling tower.

[0012] Preferably, the cold source module is a water-cooled chiller or a phase change material cold storage device.

[0013] Preferably, the plate heat exchanger and spiral tube microchannel of the distributed composite multi-stage cooling module are greater than 1, and the number is equal or the difference is 1, and they adopt an intermittent cross-distribution structure.

[0014] Preferably, the electrically controlled pump set is a frequency converter pump set, an intelligent integrated pump set, or a modular electrically controlled pump set.

[0015] Preferably, the electrically controlled valve is one of a miniature solenoid valve, an electric butterfly valve, or an electric regulating valve.

[0016] Preferably, the temperature sensor is a platinum resistance temperature sensor or a thin-film thermocouple.

[0017] Preferably, the ultrasonic flow meter is a Doppler ultrasonic flow meter or an insertion ultrasonic flow meter.

[0018] Preferably, the control module is a PLC control system or an embedded microcontroller system.

[0019] Preferably, the cooling tower, cold source module, distributed composite multi-stage cooling module, electrically controlled pump group, electrically controlled valve, temperature sensor, and ultrasonic flow meter are electrically connected to the control module, and the electrical connection method includes wired and / or wireless connection.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] 1. The colloidal dispersion of superparamagnetic ferrite nanoparticles is cooled in stages by a distributed composite multi-stage cooling module. In the high-temperature stage, the temperature is rapidly reduced by a plate heat exchanger, and in the low-temperature stage, the temperature is reduced by a spiral tube microchannel cooling. This improves the energy efficiency ratio while meeting the cooling rate requirements.

[0022] 2. The equipment uses temperature sensors and ultrasonic flow meters to cover temperature data throughout the entire cooling process, which can meet the requirements of temperature uniformity data collection for distributed composite multi-stage cooling modules.

[0023] 3. Temperature data can be collected to control and adjust the electrically controlled pump group and valves, avoiding the situation where uneven temperature during the cooling stage can lead to an excessively wide particle size distribution of the prepared superparamagnetic ferrite nanoparticles. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0025] In the diagram: 1. Cooling tower, 2. Cold source module, 3. Distributed composite multi-stage cooling module, 4. Electrically controlled pump set, 5. Electrically controlled valve, 6. Connecting pipeline, 7. Temperature sensor, 8. Ultrasonic flow meter, 9. Cooling box, 10. Plate heat exchanger, 11. Spiral tube microchannel, 12. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example

[0028] As attached Figure 1 As shown: A cooling device for preparing superparamagnetic ferrite nanoparticles by high-temperature thermal decomposition includes: a cooling tower 1, a cold source module 2, a distributed composite multi-stage cooling module 3, an electrically controlled pump group 4, an electrically controlled valve 5, connecting pipes 6, a temperature sensor 7, an ultrasonic flow meter 8, a cooling box 9, and a control module 10. The distributed composite multi-stage cooling module 3 includes at least one plate heat exchanger 11 and at least one spiral tube microchannel 12.

[0029] The distributed composite multi-stage cooling module 3, temperature sensor 7, and ultrasonic flow meter 8 are installed inside the cooling box 9, while the cooling tower 1, cold source module 2, electrically controlled pump group 4, electrically controlled valve 5, and control module 10 are installed outside the cooling box 9.

[0030] One end of the electrically controlled pump set 4 is connected to the cooling tower 1 through the connecting pipe 6, and the other end is fixed to the outer wall of the cooling box 9 and connected to the plate heat exchanger 11 through the connecting pipe 6.

[0031] One end of the electrically controlled valve 5 is connected to the cold source module 2 via a connecting pipe 6, and the other end is fixed to the outer wall of the cooling box 9 and connected to the spiral tube microchannel 12 via a connecting pipe 6;

[0032] The cooling tower 1, cold source module 2, electrically controlled pump set 4, electrically controlled valve 5, temperature sensor 6, and ultrasonic flow meter 7 are electrically connected to the control module 10.

[0033] This embodiment is the most basic implementation. In this embodiment, after the power is turned on, the control module 10 operates the electrically controlled cooling tower 1 and the electrically controlled pump group 4. The cooling process fluid flows through the connecting pipe 6, the electrically controlled pump group 4, and the connecting pipe 6 into the plate heat exchanger 11 to control the cooling of the colloidal dispersion of superparamagnetic ferrite nanoparticles in the high-temperature stage. The temperature sensor 7 collects the temperature information of the colloidal dispersion and transmits it to the control module 10. When the cooling rate is abnormal or the temperature difference is too large, the control module 10 dynamically controls the output power, flow rate, or pressure of the electrically controlled pump group 4 to achieve efficient and stable cooling in the high-temperature section.

[0034] As the cooling process enters the low-temperature cooling zone, the control module 10 stops operating the electrically controlled cooling tower 1 and the electrically controlled pump group 4, and controls the cold source module 2 and the electrically controlled valve 5 to operate. The cooling process fluid flows through the connecting pipe 6, the electrically controlled valve 5, and the connecting pipe 6 into the spiral tube microchannel 12 to control the cooling of the colloidal dispersion of superparamagnetic ferrite nanoparticles in the low-temperature stage. The temperature sensor 7 collects the temperature information of the colloidal dispersion and transmits it to the control module 10. The ultrasonic flow meter 8 collects the flow rate information of the cooling process fluid in the spiral tube microchannel 12 and transmits it to the control module 10. When the cooling rate is abnormal or the temperature difference is too large, the control module 10 controls the flow rate of the cooling process fluid by dynamically controlling the opening of the electrically controlled valve 5 to achieve efficient and stable cooling in the low-temperature cooling zone. After the cooling target value is reached, the control module 10 stops operating the electrically controlled cold source module 2 and the electrically controlled valve 5.

[0035] The above embodiments are provided merely for the purpose of describing the present invention and are not intended to limit the scope of the present invention. All equivalent substitutions and modifications made without departing from the spirit and principles of the present invention should be covered within the scope of the present invention.

Claims

1. A cooling device for preparing superparamagnetic ferrite nanoparticles by high-temperature thermal decomposition, comprising: Cooling tower, cold source module, distributed composite multi-stage cooling module, electrically controlled pump set, electrically controlled valve, connecting pipeline, temperature sensor, ultrasonic flow meter, cooling box, control module, characterized in that the distributed composite multi-stage cooling module includes at least one plate heat exchanger and at least one spiral tube microchannel; The distributed composite multi-stage cooling module, temperature sensor, and ultrasonic flow meter are installed inside the cooling box, while the cooling tower, cold source module, electrically controlled pump set, electrically controlled valve, and control module are installed outside the cooling box. One end of the electrically controlled pump unit is connected to the cooling tower via a connecting pipe, and the other end is fixed to the outer wall of the cooling box and connected to the plate heat exchanger via a connecting pipe. One end of the electrically controlled valve is connected to the cold source module via a connecting pipe, and the other end is fixed to the outer wall of the cooling box and connected to the spiral tube microchannel via a connecting pipe. The cooling tower, cold source module, electrically controlled pump set, electrically controlled valve, temperature sensor, and ultrasonic flow meter are electrically connected to the control module.

2. The cooling device for preparing superparamagnetic ferrite nanoparticles by high-temperature thermal decomposition according to claim 1, characterized in that: The cooling tower is one of the following: counter-flow cooling tower, cross-flow cooling tower, closed-circuit cooling tower, or combined flow cooling tower.

3. The cooling device for preparing superparamagnetic ferrite nanoparticles by high-temperature thermal decomposition according to claim 1, characterized in that: The aforementioned cold source module is a water-cooled chiller unit or a phase change material cold storage device.

4. The cooling device for preparing superparamagnetic ferrite nanoparticles by high-temperature thermal decomposition according to claim 1, characterized in that: The plate heat exchanger and spiral tube microchannel of the distributed composite multi-stage cooling module are greater than 1, and the number is equal or differs by 1, and they adopt an intermittent cross-distribution structure.

5. The cooling device for preparing superparamagnetic ferrite nanoparticles by high-temperature thermal decomposition according to claim 1, characterized in that: The aforementioned electrically controlled pump set is a frequency conversion control pump set, an intelligent integrated pump set, or a modular electrically controlled pump set.

6. The cooling device for preparing superparamagnetic ferrite nanoparticles by high-temperature thermal decomposition according to claim 1, characterized in that: The electrically controlled valve is one of a miniature solenoid valve, an electric butterfly valve, or an electric regulating valve.

7. The cooling device for preparing superparamagnetic ferrite nanoparticles by high-temperature thermal decomposition according to claim 1, characterized in that: The temperature sensor is a platinum resistance temperature sensor or a thin-film thermocouple.

8. The cooling device for preparing superparamagnetic ferrite nanoparticles by high-temperature thermal decomposition according to claim 1, characterized in that: The ultrasonic flow meter is either a Doppler ultrasonic flow meter or an insertion ultrasonic flow meter.

9. The cooling device for preparing superparamagnetic ferrite nanoparticles by high-temperature thermal decomposition according to claim 1, characterized in that: The control module is a PLC control system or an embedded micro-control system.

10. The cooling device for preparing superparamagnetic ferrite nanoparticles by high-temperature thermal decomposition according to claim 1, characterized in that: The cooling tower, cold source module, distributed composite multi-stage cooling module, electrically controlled pump group, electrically controlled valve, temperature sensor, and ultrasonic flow meter are electrically connected to the control module, and the electrical connection can be wired and / or wireless.

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